Christopher X J. Jensen
Associate Professor, Pratt Institute

Evolution beyond adaptation: a critical step for evolutionary theory

Posted 04 Jul 2015 / 0

The July 2015 issue of Trends in Ecology & Evolution features a really important review article entitled “Selection on stability across ecological scales“. The paper embraces the idea that the stability properties of ecological systems dictate the configuration of extant social groups, interacting species pairs, and overall ecological communities. Lev Ginzburg, my Ph.D. advisor, has Read More

A Major Post, Adaptation, Articles, Community Ecology, Ecological Modeling, Ecosystem Ecology, Evolution, Evolutionary Modeling, Macroevolution, Multilevel Selection, Predation, System Stability

Zoonosis, Ebola, and the Elusive Reservoir Host

Posted 24 Jun 2015 / 0

There’s a really interesting article in the upcoming (July 2015) issue of National Geographic entitled “Stalking a Killer“. Using the most recent outbreak of Ebola in West Africa as a case study, the article looks at the nature of a variety of unusual and rare diseases caused by filoviruses. Ebola is not a virus that Read More

A Minor Post, Articles, Belief, Cultural Evolution, Host-Pathogen Evolution, Parasitism, Predation

The costly nature of wind pollination

Posted 05 May 2015 / 2

It is once again that time of year, the time when trees that rely on wind pollination dump a really absurd amount of pollen into the air. The surfaces of outdoor objects become covered in a layer of yellow dust that is shockingly visible to the naked eye. When it rains, run-off nearly glows yellow Read More

A Minor Post, Adaptation, Behavior, Divergence, Pollination

New article in Science provides a comprehensive overview and update on Yellowstone National Park

Posted 24 Apr 2015 / 0

Since I began teaching Ecology at Pratt, I have used the re-introduction of wolves to Yellowstone as the cornerstone case study of my community ecology lessons. Using material originally developed by my colleague Damon Chaky for the Ecology for Architects course, I ask my students to use ecological theory to explain some of the changes that Read More

A Minor Post, Anthropogenic Change, Articles, Biodiversity Loss, Community Ecology, Conservation Biology, Ecology, Interactions, Keystone Species, MSCI-270, Ecology, MSCI-271, Ecology for Architects, Predation, Public Policy

Evolution 2014: Day 2

Posted 22 Jun 2014 / 0

About five years ago I developed my Evolution course, which is aimed at my non-majors art and design students. I have not taught this course in more than two years, and as it has sat on the shelf I have been able to get that critical distance necessary to make the course better. So coming Read More

A Major Post, Assessment Methods, Competition, Conferences, Cooperation, Cooperative Breeding, EvoDevo, Evolution Education, Higher Education, Mutualism, Niche Partitioning, Parasitism, Society for the Study of Evolution

Evolution 2014: Day 1

Posted 21 Jun 2014 / 0

My first session of the day was spent entirely in a Symbiosis session. I am fascinated by symbiosis, particularly mutualistic symbiosis, so I am always looking for cool new stories to help illustrate the concept for my students. This session featured a lot of talks on microbial symbionts, which are also of interest to me. The Read More

A Major Post, Coevolution, Conferences, Film & Video, Host-Pathogen Evolution, Mating systems, Microbial Ecology, Mutualism, Parasitism, Phylogenetics, Predation, Science in Art & Design, Sexual Selection, Society for the Study of Evolution

Evolution 2014: Could the right symbionts provide protection from chytrid infection to amphibians?

Posted 21 Jun 2014 / 0

Patrick McLaughlin showed work on Bioko Island suggesting that frogs there may be protected from the ill effects of chytrid infection by the presence of bacterial symbionts. These symbionts produce metabolites that lower rates of parasitic infection, suggesting that symbionts might be used to protect amphibian populations worldwide. It also suggests a mechanism by which Read More

A Minor Post, Biodiversity Loss, Coevolution, Competition, Conferences, Host-Pathogen Evolution, Invasive Species, Mutualism, Parasitism, Society for the Study of Evolution

Evolution 2014: Are island mutualist communities more likely to be nested because they are inherently more unstable?

Posted 21 Jun 2014 / 0

The interactions in ecological communities can be structured in a variety of ways, and recently there has been a push to categorize these networks along the spectrum between modular (smaller clusters of more specialized interactions) and nested (unclustered networks with more generalist species). Theoretically it is understood that the nested communities are more stable, so Read More

A Minor Post, Coevolution, Conferences, Mutualism, Mutualistic Networks, Society for the Study of Evolution

Evolution 2014: Is thyme a facultative mutualist with leguminous plants?

Posted 21 Jun 2014 / 0

Mary McKenna of Howard University presented work that suggested that thyme plants may be facultative mutualists when associated with various legume species. In work done at the Blandy Experimental Farm, her students have demonstrated that legumes growing in the presence of thyme plants form more root nodules in association with their nitrogen-fixing bacterial symbionts. This effect occurs Read More

A Minor Post, Competition, Conferences, Mutualism, Parasitism, Society for the Study of Evolution

Evolution 2014: Lemurs display huge diet diversity, and their gut microbes track this diversity

Posted 21 Jun 2014 / 0

Erin McKenney of Duke University talked about three lemur species with different diets: a frugivore (fruit-eater), a generalist, and a folivore (leaf-eater). Not surprisingly their gut morphologies and passing times vary with their diet, but McKenney showed that they also have unique trajectories as infants are colonized by symbiotic bacteria of different types.

A Minor Post, Coevolution, Conferences, Mutualism, Primates, Society for the Study of Evolution